pls PLS PLS PLS PLS E URGENTTTTT​

Pls PLS PLS PLS PLS E URGENTTTTT class=

Răspuns :

n=100+2x(1+2+3+....+99)100+2*99*100/2 2cu 2se simplifică

n=100+99*100

n=100(1+99)

n=100*100=

numărul este pătrat perfect